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CVE-2024-26689

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ceph: prevent use-after-free in encode_cap_msg() In fs/ceph/caps.c, in encode_cap_msg(), "use after free" error was caught by K…

Published Apr 3, 2024CWE-416EPSS 0.70%

Overview

CVE-2024-26689 is a high-severity vulnerability. It was published on April 3, 2024 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ceph: prevent use-after-free in encode_cap_msg()

In fs/ceph/caps.c, in encode_cap_msg(), "use after free" error was

caught by KASAN at this line - 'ceph_buffer_get(arg->xattr_buf);'. This

implies before the refcount could be increment here, it was freed.

In same file, in "handle_cap_grant()" refcount is decremented by this

line - 'ceph_buffer_put(ci->i_xattrs.blob);'. It appears that a race

occurred and resource was freed by the latter line before the former

line could increment it.

encode_cap_msg() is called by __send_cap() and __send_cap() is called by

ceph_check_caps() after calling __prep_cap(). __prep_cap() is where

arg->xattr_buf is assigned to ci->i_xattrs.blob. This is the spot where

the refcount must be increased to prevent "use after free" error.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77Refgit.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fcRefgit.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214Refgit.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7Refgit.kernel.org/stable/c/cda4672da1c26835dcbd7aec2bfed954eda9b5efRefgit.kernel.org/stable/c/f3f98d7d84b31828004545e29fd7262b9f444139Refgit.kernel.org/stable/c/70e329b440762390258a6fe8c0de93c9fdd56c77Refgit.kernel.org/stable/c/7958c1bf5b03c6f1f58e724dbdec93f8f60b96fcRefgit.kernel.org/stable/c/8180d0c27b93a6eb60da1b08ea079e3926328214Refgit.kernel.org/stable/c/ae20db45e482303a20e56f2db667a9d9c54ac7e7

How CyberStrike helps

Frequently asked questions

What is CVE-2024-26689?

CVE-2024-26689 is a high-severity vulnerability. It was published on April 3, 2024 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2024-26689?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-26689?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2024-26689?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-26689 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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